- Russian spy attack nerve agent was rare, dangerous and sophisticatedCNN
- UK says ex-spy poisoned with Soviet-developed nerve agentWashington Post
- UK, allies point finger at Russia in ex-spy poisoningYahoo News
- What A Brave Russian Scientist Told Me About Novichok, The Nerve Agent Identified In The Spy AttackNDTV
- As Putin’s Opponents Flocked to London, His Spies FollowedNew York Times